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55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/*
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* Copyright (C) 2001 Sistina Software
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*
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* This file is released under the GPL.
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*/
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#ifndef _LVM_DEV_CACHE_H
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#define _LVM_DEV_CACHE_H
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#include <sys/types.h>
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/*
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* All devices in LVM will be represented by one of these.
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* pointer comparisons are valid.
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*/
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struct device {
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char *name;
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dev_t dev;
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};
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struct dev_filter {
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int (*passes_filter)(struct dev_filter *f, struct device *dev);
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void *private;
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};
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/*
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* The global device cache.
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*/
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int dev_cache_init(void);
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void dev_cache_exit(void);
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int dev_cache_add_dir(const char *path);
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struct device *dev_cache_get(const char *name);
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/*
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* Object for iterating through the cache.
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*/
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struct dev_iter;
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struct dev_iter *dev_iter_create(struct dev_filter *f);
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void dev_iter_destroy(struct dev_iter *iter);
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struct device *dev_iter_get(struct dev_iter *iter);
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/*
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* All io should use these routines, rather than opening the devices
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* by hand. You do not have to call an open routine.
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*/
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__uint64_t dev_get_size(struct device *dev); /* in 512 byte sectors */
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ssize_t dev_read(struct device *dev, size_t offset, size_t len, void *buffer);
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ssize_t dev_write(struct device *dev, size_t offset, size_t len, void *buffer);
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#endif
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